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R55 / Mc:Mc-1

Diagram Notation decorates exactly one Stem Signification

Stem Signification is decorated by exactly one Diagram Notation

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Each Diagram Notation may specify a different decoration for a Stem Signification. The Starr class diagram notation, for example assigns a double hollow arrow at the root end of a class mult - Mc mult Stem Signification. xUML, on the other hand specifies only a text label of 0..*for that same Stem Signification.

In fact, a Stem Signification may not be decorated at all in a given Diagram Notation. The from state – source state Stem Signification on a state machine diagram, for example, is not decorated in xUML while the to state - target state is.

A given Diagram Notation only specifies decoration for those Stem Significations relevant to the associated Diagram Type. Thus the, Starr - class Diagram Notation does not specify decoration on any Stem Significations on a state machine diagram.